Already done 👍 https://github.com/gzuuus/nostrichat-extension Also highlighter does it too

-a personal relay that stores all ones personal posts, to serve as an archive and to facilitate moving from one other-people facing relay to another. -a personal relay that stores personal conversations, which can replace E-mail and instant messaging applications. -primarily read-only relays where influencers host their content for distribution to other relays, either programmatically or when readers want to share the content in their own communities. -community relays meant ONLY for members of a community -mirror relays, which provide redundancy if a relay goes down

Those are some of my relay ideas.